Choose "Exhibition" from the main menu and choose a team. When the "VS'screen appears, enter any of the following codes to get different effects.

Infinite Turbo:
Start, Start, Start, Start, Start, B, A, A, A, A, Up

No Fumbles:
Start, Start, Start, Start, B, B, A, A, A, Left

Invisible Receiver:
Start, Start, Start, Start, B, B, B, A, A, A,Up

No Pointer:
Start, Start, Start, B, B, B, A, A, A, Left

Start in Overtime:
Start, Start, A, A, Right

Parking Lot Field:
Start, Start, Start, B, B, B, A, A, A, Down

Space Field:
Start, Start, A, A, Right

Night Game:
Start, Start, B, B, A, A, Right

Predator Mode:
Start, Start, Start, Start, Start, B, B, B, B, B, A, Up